Magnetoresistance is the property of a material to change the value of its electrical resistance when an external magnetic field is applied to it. The effect was first discovered by William Thomson (better known as Lord Kelvin) in 1851, but he was unable to lower the electrical resistance of anything by more than 5%. This effect was later called o...
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http://en.wikipedia.org/wiki/Magnetoresistance
(from the article `Nobel Prizes`) The fact that the resistance of an electrical conductor can be altered by an external magnetic field, a phenomenon called magnetoresistance, was ... ...The process of epitaxy is general, however, and so can occur for other classes of materials, such as metals and oxides, which have been used since ... ...
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http://www.britannica.com/eb/a-z/m/11
change of the resistivity of a substance due to an applied magnetic field
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=121-12-83
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